I always give you my feedback on these. The first two times I backed myself into a corner with duplicates and, of course, I have no clue as to what mistakes I made.

Finally got it on the third try, doing basically what I did on the first two. There were lots of triples which fell into place early, strong links all over the place and a number of "almost" URs.

But I couldn't find anything to do with the above, so I solved it with brute force, four chains that resulted in contradictions, with an X-Wing mixed in. I'm sure there was a more finesseful (is that a word?) way to solve it, but damned if I could find it.